3D-WSS and pressure fields measurement in cerebral aneurysm models by scanning-stereoscopic PIV

Hemodynamic parameters, such as wall shear stress (WSS) and pressure distributions, are considered critical in understanding the underlying causes of cerebrovascular diseases, especially cerebral aneurysms. In this study, we present an integrated experimental approach to evaluate WSS and pressure distribution based on a realistic vascular models. A silicone-based artificial vessel model with an aneurysm was fabricated, and three-dimensional, three-component velocity fields were measured using scanning-stereoscopic PIV (SSPIV). To accurately reconstruct the vessel wall geometry, we developed a novel method that estimates the wall surface directly from the PIV particle images while accounting for geometric errors introduced during the fabrication process. This method enables precise reproduction of the actual model geometry, allowing for accurate derivation of WSS and pressure fields from the velocity data. The results demonstrate the potential of the SSPIV-based approach for hemodynamics evaluation for cerebrovascular diagnostics.